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audioregion.cc

/*
    Copyright (C) 2000-2001 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.

    $Id: audioregion.cc,v 1.54 2005/09/10 17:34:25 pauld Exp $
*/

#include <cmath>
#include <climits>
#include <cfloat>

#include <set>

#include <sigc++/bind.h>
#include <sigc++/class_slot.h>

#include <pbd/basename.h>
#include <pbd/lockmonitor.h>
#include <pbd/xml++.h>

#include <ardour/audioregion.h>
#include <ardour/session.h>
#include <ardour/gain.h>
#include <ardour/dB.h>
#include <ardour/playlist.h>
#include <ardour/audiofilter.h>

#include "i18n.h"
#include <locale.h>

using namespace std;
using namespace ARDOUR;

/* a Session will reset these to its chosen defaults by calling AudioRegion::set_default_fade() */

Change AudioRegion::FadeInChanged = ARDOUR::new_change();
Change AudioRegion::FadeOutChanged = ARDOUR::new_change();
Change AudioRegion::FadeInActiveChanged = ARDOUR::new_change();
Change AudioRegion::FadeOutActiveChanged = ARDOUR::new_change();
Change AudioRegion::EnvelopeActiveChanged = ARDOUR::new_change();
Change AudioRegion::ScaleAmplitudeChanged = ARDOUR::new_change();
Change AudioRegion::EnvelopeChanged = ARDOUR::new_change();

AudioRegionState::AudioRegionState (string why)
      : RegionState (why),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
}

AudioRegion::AudioRegion (Source& src, jack_nframes_t start, jack_nframes_t length, bool announce)
      : Region (start, length, PBD::basename_nosuffix(src.name()), 0,  Region::Flag(Region::DefaultFlags|Region::External)),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
      /* basic AudioRegion constructor */

      sources.push_back (&src);
      master_sources.push_back (&src);
      src.GoingAway.connect (slot (*this, &AudioRegion::source_deleted));

      _scale_amplitude = 1.0;

      set_default_fades ();
      set_default_envelope ();
      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      if (announce) {
             CheckNewRegion (this); /* EMIT SIGNAL */
      }
}

AudioRegion::AudioRegion (Source& src, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t layer, Flag flags, bool announce)
      : Region (start, length, name, layer, flags),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
      /* basic AudioRegion constructor */

      sources.push_back (&src);
      master_sources.push_back (&src);
      src.GoingAway.connect (slot (*this, &AudioRegion::source_deleted));

      _scale_amplitude = 1.0;

      set_default_fades ();
      set_default_envelope ();
      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      if (announce) {
             CheckNewRegion (this); /* EMIT SIGNAL */
      }
}

AudioRegion::AudioRegion (SourceList& srcs, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t layer, Flag flags, bool announce)
      : Region (start, length, name, layer, flags),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
      /* basic AudioRegion constructor */

      for (SourceList::iterator i=srcs.begin(); i != srcs.end(); ++i) {
            sources.push_back (*i);
            master_sources.push_back (*i);

            (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
      }

      _scale_amplitude = 1.0;

      set_default_fades ();
      set_default_envelope ();
      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      if (announce) {
             CheckNewRegion (this); /* EMIT SIGNAL */
      }
}


AudioRegion::AudioRegion (const AudioRegion& other, jack_nframes_t offset, jack_nframes_t length, const string& name, layer_t layer, Flag flags, bool announce)
      : Region (other, offset, length, name, layer, flags),
        _fade_in (other._fade_in),
        _fade_out (other._fade_out),
        _envelope (other._envelope, (double) offset, (double) offset + length) 
{
      /* create a new AudioRegion, that is part of an existing one */
      
      set<Source*> unique_srcs;

      for (SourceList::const_iterator i= other.sources.begin(); i != other.sources.end(); ++i) {
            sources.push_back (*i);
            (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            unique_srcs.insert (*i);
      }

      for (SourceList::const_iterator i = other.master_sources.begin(); i != other.master_sources.end(); ++i) {
            if (unique_srcs.find (*i) == unique_srcs.end()) {
                  (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            }
            master_sources.push_back (*i);
      }

      /* return to default fades if the existing ones are too long */

      if (_flags & LeftOfSplit) {
            if (_fade_in.back()->when >= _length) {
                  set_default_fade_in ();
            }
            set_default_fade_out ();
            _flags = Flag (_flags & ~Region::RightOfSplit);
      }

      if (_flags & RightOfSplit) {
            if (_fade_out.back()->when >= _length) {
                  set_default_fade_out ();
            }
            set_default_fade_in ();
            _flags = Flag (_flags & ~Region::LeftOfSplit);
      }

      _scale_amplitude = other._scale_amplitude;

      _fade_in_disabled = 0;
      _fade_out_disabled = 0;

      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      if (announce) {
            CheckNewRegion (this); /* EMIT SIGNAL */
      }
}

AudioRegion::AudioRegion (const AudioRegion &other)
      : Region (other),
        _fade_in (other._fade_in),
        _fade_out (other._fade_out),
        _envelope (other._envelope) 
{
      /* Pure copy constructor */

      set<Source*> unique_srcs;

      for (SourceList::const_iterator i = other.sources.begin(); i != other.sources.end(); ++i) {
            sources.push_back (*i);
            (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            unique_srcs.insert (*i);
      }

      for (SourceList::const_iterator i = other.master_sources.begin(); i != other.master_sources.end(); ++i) {
            master_sources.push_back (*i);
            if (unique_srcs.find (*i) == unique_srcs.end()) {
                  (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            }
      }

      _scale_amplitude = other._scale_amplitude;
      _envelope = other._envelope;

      _fade_in_disabled = 0;
      _fade_out_disabled = 0;
      
      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      /* NOTE: no CheckNewRegion signal emitted here. This is the copy constructor */
}

AudioRegion::AudioRegion (Source& src, const XMLNode& node)
      : Region (node),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
      sources.push_back (&src);
      master_sources.push_back (&src);
      src.GoingAway.connect (slot (*this, &AudioRegion::source_deleted));

      set_default_fades ();

      if (set_state (node)) {
            throw failed_constructor();
      }

      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      CheckNewRegion (this); /* EMIT SIGNAL */
}

AudioRegion::AudioRegion (SourceList& srcs, const XMLNode& node)
      : Region (node),
        _fade_in (0.0, 2.0, 1.0, false),
        _fade_out (0.0, 2.0, 1.0, false),
        _envelope (0.0, 2.0, 1.0, false)
{
      /* basic AudioRegion constructor */

      set<Source*> unique_srcs;

      for (SourceList::iterator i=srcs.begin(); i != srcs.end(); ++i) {
            sources.push_back (*i);
            (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            unique_srcs.insert (*i);
      }

      for (SourceList::iterator i = srcs.begin(); i != srcs.end(); ++i) {
            master_sources.push_back (*i);
            if (unique_srcs.find (*i) == unique_srcs.end()) {
                  (*i)->GoingAway.connect (slot (*this, &AudioRegion::source_deleted));
            }
      }

      set_default_fades ();
      _scale_amplitude = 1.0;

      if (set_state (node)) {
            throw failed_constructor();
      }

      save_state ("initial state");

      _envelope.StateChanged.connect (slot (*this, &AudioRegion::envelope_changed));

      CheckNewRegion (this); /* EMIT SIGNAL */
}

AudioRegion::~AudioRegion ()
{
      GoingAway (this);
}

StateManager::State*
AudioRegion::state_factory (std::string why) const
{
      AudioRegionState* state = new AudioRegionState (why);

      Region::store_state (*state);

      state->_fade_in = _fade_in;
      state->_fade_out = _fade_out;
      state->_envelope = _envelope;
      state->_scale_amplitude = _scale_amplitude;
      state->_fade_in_disabled = _fade_in_disabled;
      state->_fade_out_disabled = _fade_out_disabled;

      return state;
}     

Change
AudioRegion::restore_state (StateManager::State& sstate) 
{
      AudioRegionState* state = dynamic_cast<AudioRegionState*> (&sstate);

      Change what_changed = Region::restore_and_return_flags (*state);
      
      if (_flags != Flag (state->_flags)) {
            
            uint32_t old_flags = _flags;
            
            _flags = Flag (state->_flags);
            
            if ((old_flags ^ state->_flags) & EnvelopeActive) {
                  what_changed = Change (what_changed|EnvelopeActiveChanged);
            }
      }
            
      if (!(_fade_in == state->_fade_in)) {
            _fade_in = state->_fade_in;
            what_changed = Change (what_changed|FadeInChanged);
      }

      if (!(_fade_out == state->_fade_out)) {
            _fade_out = state->_fade_out;
            what_changed = Change (what_changed|FadeOutChanged);
      }

      if (_scale_amplitude != state->_scale_amplitude) {
            _scale_amplitude = state->_scale_amplitude;
            what_changed = Change (what_changed|ScaleAmplitudeChanged);
      }

      if (_fade_in_disabled != state->_fade_in_disabled) {
            if (_fade_in_disabled == 0 && state->_fade_in_disabled) {
                  set_fade_in_active (false);
            } if (_fade_in_disabled && state->_fade_in_disabled == 0) {
                  set_fade_in_active (true);
            }
            _fade_in_disabled = state->_fade_in_disabled;
      }
            
      if (_fade_out_disabled != state->_fade_out_disabled) {
            if (_fade_out_disabled == 0 && state->_fade_out_disabled) {
                  set_fade_out_active (false);
            } if (_fade_out_disabled && state->_fade_out_disabled == 0) {
                  set_fade_out_active (true);
            }
            _fade_out_disabled = state->_fade_out_disabled;
      }

      /* XXX need a way to test stored state versus current for envelopes */

      _envelope = state->_envelope;
      what_changed = Change (what_changed);

      return what_changed;
}

UndoAction
AudioRegion::get_memento() const
{
      return bind (slot (*(const_cast<AudioRegion *> (this)), &StateManager::use_state), _current_state_id);
}

bool
AudioRegion::verify_length (jack_nframes_t len)
{
      for (uint32_t n=0; n < sources.size(); ++n) {
            if (_start > sources[n]->length() - len) {
                  return false;
            }
      }
      return true;
}

bool
AudioRegion::verify_start_and_length (jack_nframes_t new_start, jack_nframes_t new_length)
{
      for (uint32_t n=0; n < sources.size(); ++n) {
            if (new_length > sources[n]->length() - new_start) {
                  return false;
            }
      }
      return true;
}
bool
AudioRegion::verify_start (jack_nframes_t pos)
{
      for (uint32_t n=0; n < sources.size(); ++n) {
            if (pos > sources[n]->length() - _length) {
                  return false;
            }
      }
      return true;
}

bool
AudioRegion::verify_start_mutable (jack_nframes_t& new_start)
{
      for (uint32_t n=0; n < sources.size(); ++n) {
            if (new_start > sources[n]->length() - _length) {
                  new_start = sources[n]->length() - _length;
            }
      }
      return true;
}
void
AudioRegion::set_envelope_active (bool yn)
{
      if (envelope_active() != yn) {
            char buf[64];
            if (yn) {
                  snprintf (buf, sizeof (buf), "envelope active");
                  _flags = Flag (_flags|EnvelopeActive);
            } else {
                  snprintf (buf, sizeof (buf), "envelope off");
                  _flags = Flag (_flags & ~EnvelopeActive);
            }
            if (!_frozen) {
                  save_state (buf);
            }
            send_change (EnvelopeActiveChanged);

      }
}

jack_nframes_t
AudioRegion::read_peaks (PeakData *buf, jack_nframes_t npeaks, jack_nframes_t offset, jack_nframes_t cnt, uint32_t chan_n, double samples_per_unit) const
{
      if (chan_n >= sources.size()) {
            return 0; 
      }
      
      if (sources[chan_n]->read_peaks (buf, npeaks, offset, cnt, samples_per_unit)) {
            return 0;
      } else {
            if (_scale_amplitude != 1.0) {
                  for (jack_nframes_t n = 0; n < npeaks; ++n) {
                        buf[n].max *= _scale_amplitude;
                        buf[n].min *= _scale_amplitude;
                  }
            }
            return cnt;
      }
}

jack_nframes_t
AudioRegion::read_at (Sample *buf, Sample *mixdown_buffer, float *gain_buffer, jack_nframes_t position, 
                  jack_nframes_t cnt, 
                  uint32_t chan_n, jack_nframes_t read_frames, jack_nframes_t skip_frames) const
{
      return _read_at (sources, buf, mixdown_buffer, gain_buffer, position, cnt, chan_n, read_frames, skip_frames);
}

jack_nframes_t
AudioRegion::master_read_at (Sample *buf, Sample *mixdown_buffer, float *gain_buffer, jack_nframes_t position, 
                       jack_nframes_t cnt, uint32_t chan_n) const
{
      return _read_at (master_sources, buf, mixdown_buffer, gain_buffer, position, cnt, chan_n, 0, 0);
}

jack_nframes_t
AudioRegion::_read_at (const SourceList& srcs, Sample *buf, Sample *mixdown_buffer, float *gain_buffer, 
                   jack_nframes_t position, jack_nframes_t cnt, 
                   uint32_t chan_n, jack_nframes_t read_frames, jack_nframes_t skip_frames) const
{
      jack_nframes_t internal_offset;
      jack_nframes_t buf_offset;
      jack_nframes_t to_read;
      
      /* precondition: caller has verified that we cover the desired section */

      if (chan_n >= sources.size()) {
            return 0; /* read nothing */
      }
      
      if (position < _position) {
            internal_offset = 0;
            buf_offset = _position - position;
            cnt -= buf_offset;
      } else {
            internal_offset = position - _position;
            buf_offset = 0;
      }

      if (internal_offset >= _length) {
            return 0; /* read nothing */
      }
      

      if ((to_read = min (cnt, _length - internal_offset)) == 0) {
            return 0; /* read nothing */
      }

      if (opaque()) {
            /* overwrite whatever is there */
            mixdown_buffer = buf + buf_offset;
      } else {
            mixdown_buffer += buf_offset;
      }

      if (muted()) {
            return 0; /* read nothing */
      }

      _read_data_count = 0;

      if (srcs[chan_n]->read (mixdown_buffer, _start + internal_offset, to_read) != to_read) {
            return 0; /* "read nothing" */
      }

      _read_data_count += srcs[chan_n]->read_data_count();

      /* fade in */

      if (_flags & FadeIn) {

            jack_nframes_t fade_in_length = (jack_nframes_t) _fade_in.back()->when;
            
            /* see if this read is within the fade in */

            if (internal_offset < fade_in_length) {
                  
                  jack_nframes_t limit;

                  limit = min (to_read, fade_in_length - internal_offset);

                  _fade_in.get_vector (internal_offset, internal_offset+limit, gain_buffer, limit);

                  for (jack_nframes_t n = 0; n < limit; ++n) {
                        mixdown_buffer[n] *= gain_buffer[n];
                  }
            }
      }
      
      /* fade out */

      if (_flags & FadeOut) {
      


      
            /* see if some part of this read is within the fade out */

            /* .................        >|            REGION
                                        _length
                                  
                                 {           }            FADE
                                     fade_out_length
                                 ^                               
                               _length - fade_out_length
                        |--------------|
                        ^internal_offset
                                       ^internal_offset + to_read

                  we need the intersection of [internal_offset,internal_offset+to_read] with
                  [_length - fade_out_length, _length]

            */

      
            jack_nframes_t fade_out_length = (jack_nframes_t) _fade_out.back()->when;
            jack_nframes_t fade_interval_start = max(internal_offset, _length-fade_out_length);
            jack_nframes_t fade_interval_end   = min(internal_offset + to_read, _length);

            if (fade_interval_end > fade_interval_start) {
                  /* (part of the) the fade out is  in this buffer */
                  
                  jack_nframes_t limit = fade_interval_end - fade_interval_start;
                  jack_nframes_t curve_offset = fade_interval_start - (_length-fade_out_length);
                  jack_nframes_t fade_offset = fade_interval_start - internal_offset;
                                                       
                  _fade_out.get_vector (curve_offset,curve_offset+limit, gain_buffer, limit);

                  for (jack_nframes_t n = 0, m = fade_offset; n < limit; ++n, ++m) {
                        mixdown_buffer[m] *= gain_buffer[n];
                  }
            } 

      }

      /* Regular gain curves */

      if (envelope_active())  {
            _envelope.get_vector (internal_offset, internal_offset + to_read, gain_buffer, to_read);
            
            if (_scale_amplitude != 1.0f) {
                  for (jack_nframes_t n = 0; n < to_read; ++n) {
                        mixdown_buffer[n] *= gain_buffer[n] * _scale_amplitude;
                  }
            } else {
                  for (jack_nframes_t n = 0; n < to_read; ++n) {
                        mixdown_buffer[n] *= gain_buffer[n];
                  }
            }
      } else if (_scale_amplitude != 1.0f) {
            Session::apply_gain_to_buffer (mixdown_buffer, to_read, _scale_amplitude);
      }

      if (!opaque()) {

            /* gack. the things we do for users.
             */

            buf += buf_offset;

            for (jack_nframes_t n = 0; n < to_read; ++n) {
                  buf[n] += mixdown_buffer[n];
            }
      } 
      
      return to_read;
}
      
XMLNode&
AudioRegion::get_state ()
{
      return state (true);
}

XMLNode&
AudioRegion::state (bool full)
{
      XMLNode& node (Region::state (full));
      XMLNode *child;
      char buf[64];
      char buf2[64];
      LocaleGuard lg (X_("POSIX"));
      
      snprintf (buf, sizeof (buf), "0x%x", (int) _flags);
      node.add_property ("flags", buf);
      snprintf (buf, sizeof(buf), "%f", _scale_amplitude);
      node.add_property ("scale-gain", buf);

      for (uint32_t n=0; n < sources.size(); ++n) {
            snprintf (buf2, sizeof(buf2), "source-%d", n);
            snprintf (buf, sizeof(buf), "%" PRIu64, sources[n]->id());
            node.add_property (buf2, buf);
      }

      snprintf (buf, sizeof (buf), "%u", (uint32_t) sources.size());
      node.add_property ("channels", buf);

      if (full) {
      
            child = node.add_child (X_("FadeIn"));
            
            if ((_flags & DefaultFadeIn)) {
                  child->add_property (X_("default"), X_("yes"));
            } else {
                  _fade_in.store_state (*child);
            }
            
            child = node.add_child (X_("FadeOut"));
            
            if ((_flags & DefaultFadeOut)) {
                  child->add_property (X_("default"), X_("yes"));
            } else {
                  _fade_out.store_state (*child);
            }
      }
      
      child = node.add_child ("Envelope");

      if (full) {
            bool default_env = false;
            
            // If there are only two points, the points are in the start of the region and the end of the region
            // so, if they are both at 1.0f, that means the default region.
            if (_envelope.size() == 2 &&
                _envelope.front()->value == 1.0f &&
                _envelope.back()->value==1.0f) {
                  if (_envelope.front()->when == 0 && _envelope.back()->when == _length) {
                        default_env = true;
                  }
            } 
            
            if (default_env) {
                  child->add_property ("default", "yes");
            } else {
                  _envelope.store_state (*child);
            }
      } else {
            child->add_property ("default", "yes");
      }

      if (full && _extra_xml) {
            node.add_child_copy (*_extra_xml);
      }

      return node;
}

int
AudioRegion::set_state (const XMLNode& node)
{
      const XMLNodeList& nlist = node.children();
      const XMLProperty *prop;
      LocaleGuard lg (X_("POSIX"));

      Region::set_state (node);

      if ((prop = node.property ("flags")) != 0) {
            _flags = Flag (strtol (prop->value().c_str(), (char **) 0, 16));
      }

      if ((prop = node.property ("scale-gain")) != 0) {
            _scale_amplitude = atof (prop->value().c_str());
      } else {
            _scale_amplitude = 1.0;
      }
      
      /* Now find envelope description and other misc child items */
                        
      for (XMLNodeConstIterator niter = nlist.begin(); niter != nlist.end(); ++niter) {
            
            XMLNode *child;
            XMLProperty *prop;
            
            child = (*niter);
            
            if (child->name() == "Envelope") {
                  
                  _envelope.clear ();

                  if ((prop = child->property ("default")) != 0) {
                        set_default_envelope ();
                  } else {
                        _envelope.load_state (*child);
                  }

                  _envelope.set_max_xval (_length);
                  _envelope.truncate_end (_length);
                  
            } else if (child->name() == "FadeIn") {
                  
                  _fade_in.clear ();
                  
                  if ((prop = child->property ("default")) != 0 || (prop = child->property ("steepness")) != 0) {
                        set_default_fade_in ();
                  } else {
                        
                        _fade_in.load_state (*child);
                  }

            } else if (child->name() == "FadeOut") {
                  
                  _fade_out.clear ();

                  if ((prop = child->property ("default")) != 0 || (prop = child->property ("steepness")) != 0) {
                        set_default_fade_out ();
                  } else {
                        _fade_out.load_state (*child);
                  }
            } 
      }

      return 0;
}

void
AudioRegion::set_fade_in_shape (FadeShape shape)
{
      set_fade_in (shape, (jack_nframes_t) _fade_in.back()->when);
}

void
AudioRegion::set_fade_out_shape (FadeShape shape)
{
      set_fade_out (shape, (jack_nframes_t) _fade_out.back()->when);
}

void
AudioRegion::set_fade_in (FadeShape shape, jack_nframes_t len)
{
      _fade_in.freeze ();
      _fade_in.clear ();

      switch (shape) {
      case Linear:
            _fade_in.add (0.0, 0.0);
            _fade_in.add (len, 1.0);
            break;

      case Fast:
            _fade_in.add (0, 0);
            _fade_in.add (len * 0.389401, 0.0333333);
            _fade_in.add (len * 0.629032, 0.0861111);
            _fade_in.add (len * 0.829493, 0.233333);
            _fade_in.add (len * 0.9447, 0.483333);
            _fade_in.add (len * 0.976959, 0.697222);
            _fade_in.add (len, 1);
            break;

      case Slow:
            _fade_in.add (0, 0);
            _fade_in.add (len * 0.0207373, 0.197222);
            _fade_in.add (len * 0.0645161, 0.525);
            _fade_in.add (len * 0.152074, 0.802778);
            _fade_in.add (len * 0.276498, 0.919444);
            _fade_in.add (len * 0.481567, 0.980556);
            _fade_in.add (len * 0.767281, 1);
            _fade_in.add (len, 1);
            break;

      case LogA:
            _fade_in.add (0, 0);
            _fade_in.add (len * 0.0737327, 0.308333);
            _fade_in.add (len * 0.246544, 0.658333);
            _fade_in.add (len * 0.470046, 0.886111);
            _fade_in.add (len * 0.652074, 0.972222);
            _fade_in.add (len * 0.771889, 0.988889);
            _fade_in.add (len, 1);
            break;

      case LogB:
            _fade_in.add (0, 0);
            _fade_in.add (len * 0.304147, 0.0694444);
            _fade_in.add (len * 0.529954, 0.152778);
            _fade_in.add (len * 0.725806, 0.333333);
            _fade_in.add (len * 0.847926, 0.558333);
            _fade_in.add (len * 0.919355, 0.730556);
            _fade_in.add (len, 1);
            break;
      }

      _fade_in.thaw ();
      _fade_in_shape = shape;

      if (!_frozen) {
            save_state (_("fade in change"));
      }

      send_change (FadeInChanged);
}

void
AudioRegion::set_fade_out (FadeShape shape, jack_nframes_t len)
{
      _fade_out.freeze ();
      _fade_out.clear ();

      switch (shape) {
      case Fast:
            _fade_out.add (len * 0, 1);
            _fade_out.add (len * 0.023041, 0.697222);
            _fade_out.add (len * 0.0553,   0.483333);
            _fade_out.add (len * 0.170507, 0.233333);
            _fade_out.add (len * 0.370968, 0.0861111);
            _fade_out.add (len * 0.610599, 0.0333333);
            _fade_out.add (len * 1, 0);
            break;

      case LogA:
            _fade_out.add (len * 0, 1);
            _fade_out.add (len * 0.228111, 0.988889);
            _fade_out.add (len * 0.347926, 0.972222);
            _fade_out.add (len * 0.529954, 0.886111);
            _fade_out.add (len * 0.753456, 0.658333);
            _fade_out.add (len * 0.9262673, 0.308333);
            _fade_out.add (len * 1, 0);
            break;

      case Slow:
            _fade_out.add (len * 0, 1);
            _fade_out.add (len * 0.305556, 1);
            _fade_out.add (len * 0.548611, 0.991736);
            _fade_out.add (len * 0.759259, 0.931129);
            _fade_out.add (len * 0.918981, 0.68595);
            _fade_out.add (len * 0.976852, 0.22865);
            _fade_out.add (len * 1, 0);
            break;

      case LogB:
            _fade_out.add (len * 0, 1);
            _fade_out.add (len * 0.080645, 0.730556);
            _fade_out.add (len * 0.277778, 0.289256);
            _fade_out.add (len * 0.470046, 0.152778);
            _fade_out.add (len * 0.695853, 0.0694444);
            _fade_out.add (len * 1, 0);
            break;

      case Linear:
            _fade_out.add (len * 0, 1);
            _fade_out.add (len * 1, 0);
            break;
      }

      _fade_out.thaw ();
      _fade_out_shape = shape;

      if (!_frozen) {
            save_state (_("fade in change"));
      }

      send_change (FadeOutChanged);
}

void
AudioRegion::set_fade_in_length (jack_nframes_t len)
{
      bool changed = _fade_in.extend_to (len);

      if (changed) {
            _flags = Flag (_flags & ~DefaultFadeIn);

            if (!_frozen) {
                  char buf[64];
                  snprintf (buf, sizeof (buf), "fade in length changed to %u", len);
                  save_state (buf);
            }
            
            send_change (FadeInChanged);
      }
}

void
AudioRegion::set_fade_out_length (jack_nframes_t len)
{
      bool changed =    _fade_out.extend_to (len);

      if (changed) {
            _flags = Flag (_flags & ~DefaultFadeOut);
            
            if (!_frozen) {
                  char buf[64];
                  snprintf (buf, sizeof (buf), "fade out length changed to %u", len);
                  save_state (buf);
            }
      }

      send_change (FadeOutChanged);
}

void
AudioRegion::set_fade_in_active (bool yn)
{
      if (yn == (_flags & FadeIn)) {
            return;
      }
      if (yn) {
            _flags = Flag (_flags|FadeIn);
      } else {
            _flags = Flag (_flags & ~FadeIn);
      }

      send_change (FadeInActiveChanged);
}

void
AudioRegion::set_fade_out_active (bool yn)
{
      if (yn == (_flags & FadeOut)) {
            return;
      }
      if (yn) {
            _flags = Flag (_flags | FadeOut);
      } else {
            _flags = Flag (_flags & ~FadeOut);
      }

      send_change (FadeOutActiveChanged);
}

void
AudioRegion::set_default_fade_in ()
{
      set_fade_in (Linear, 64);
}

void
AudioRegion::set_default_fade_out ()
{
      set_fade_out (Linear, 64);
}

void
AudioRegion::set_default_fades ()
{
      _fade_in_disabled = 0;
      _fade_out_disabled = 0;
      set_default_fade_in ();
      set_default_fade_out ();
}

void
AudioRegion::set_default_envelope ()
{
      _envelope.freeze ();
      _envelope.clear ();
      _envelope.add (0, 1.0f);
      _envelope.add (_length, 1.0f);
      _envelope.thaw ();
}

void
AudioRegion::recompute_at_end ()
{
      /* our length has changed. recompute a new final point by interpolating 
         based on the the existing curve.
      */
      
      _envelope.freeze ();
      _envelope.truncate_end (_length);
      _envelope.set_max_xval (_length);
      _envelope.thaw ();

      if (_fade_in.back()->when > _length) {
            _fade_in.extend_to (_length);
            send_change (FadeInChanged);
      }

      if (_fade_out.back()->when > _length) {
            _fade_out.extend_to (_length);
            send_change (FadeOutChanged);
      }
}     

void
AudioRegion::recompute_at_start ()
{
      /* as above, but the shift was from the front */

      _envelope.truncate_start (_length);

      if (_fade_in.back()->when > _length) {
            _fade_in.extend_to (_length);
            send_change (FadeInChanged);
      }

      if (_fade_out.back()->when > _length) {
            _fade_out.extend_to (_length);
            send_change (FadeOutChanged);
      }
}

int
AudioRegion::separate_by_channel (Session& session, vector<AudioRegion*>& v) const
{
      SourceList srcs;
      string new_name;

      for (SourceList::const_iterator i = master_sources.begin(); i != master_sources.end(); ++i) {

            srcs.clear ();
            srcs.push_back (*i);

            /* generate a new name */
            
            if (session.region_name (new_name, _name)) {
                  return -1;
            }

            /* create a copy with just one source */

            v.push_back (new AudioRegion (srcs, _start, _length, new_name, _layer, _flags));
      }

      return 0;
}

void
AudioRegion::source_deleted (Source* ignored)
{
      delete this;
}

void
AudioRegion::lock_sources ()
{
      SourceList::iterator i;
      set<Source*> unique_srcs;

      for (i = sources.begin(); i != sources.end(); ++i) {
            unique_srcs.insert (*i);
            (*i)->use ();
      }

      for (i = master_sources.begin(); i != master_sources.end(); ++i) {
            if (unique_srcs.find (*i) == unique_srcs.end()) {
                  (*i)->use ();
            }
      }
}

void
AudioRegion::unlock_sources ()
{
      SourceList::iterator i;
      set<Source*> unique_srcs;

      for (i = sources.begin(); i != sources.end(); ++i) {
            unique_srcs.insert (*i);
            (*i)->release ();
      }

      for (i = master_sources.begin(); i != master_sources.end(); ++i) {
            if (unique_srcs.find (*i) == unique_srcs.end()) {
                  (*i)->release ();
            }
      }
}

vector<string>
AudioRegion::master_source_names ()
{
      SourceList::iterator i;

      vector<string> names;
      for (i = master_sources.begin(); i != master_sources.end(); ++i) {
            names.push_back((*i)->name());
      }

      return names;
}

bool
AudioRegion::region_list_equivalent (const AudioRegion& other)
{
      return size_equivalent (other) && source_equivalent (other) && _name == other._name;
}

bool
AudioRegion::source_equivalent (const AudioRegion& other)
{
      SourceList::iterator i;
      SourceList::const_iterator io;

      for (i = sources.begin(), io = other.sources.begin(); i != sources.end() && io != other.sources.end(); ++i, ++io) {
            if ((*i)->id() != (*io)->id()) {
                  return false;
            }
      }

      for (i = master_sources.begin(), io = other.master_sources.begin(); i != master_sources.end() && io != other.master_sources.end(); ++i, ++io) {
            if ((*i)->id() != (*io)->id()) {
                  return false;
            }
      }

      return true;
}

bool
AudioRegion::equivalent (const AudioRegion& other)
{
      return _start == other._start &&
            _position == other._position &&
            _length == other._length;
}

bool
AudioRegion::size_equivalent (const AudioRegion& other)
{
      return _start == other._start &&
            _length == other._length;
}

int
AudioRegion::apply (AudioFilter& filter)
{
      return filter.run (*this);
}

int
AudioRegion::exportme (Session& session, AudioExportSpecification& spec)
{
      const jack_nframes_t blocksize = 4096;
      jack_nframes_t to_read;
      int status = -1;

      spec.channels = sources.size();

      if (spec.prepare (blocksize, session.frame_rate())) {
            goto out;
      }

      spec.pos = 0;
      spec.total_frames = _length;

      while (spec.pos < _length && !spec.stop) {
            
            
            /* step 1: interleave */
            
            to_read = min (_length - spec.pos, blocksize);
            
            if (spec.channels == 1) {

                  if (sources.front()->read (spec.dataF, _start + spec.pos, to_read) != to_read) {
                        goto out;
                  }

            } else {

                  Sample buf[blocksize];

                  for (uint32_t chan = 0; chan < spec.channels; ++chan) {
                        
                        if (sources[chan]->read (buf, _start + spec.pos, to_read) != to_read) {
                              goto out;
                        }
                        
                        for (jack_nframes_t x = 0; x < to_read; ++x) {
                              spec.dataF[chan+(x*spec.channels)] = buf[x];
                        }
                  }
            }
            
            if (spec.process (to_read)) {
                  goto out;
            }
            
            spec.pos += to_read;
            spec.progress = (double) spec.pos /_length;
            
      }
      
      status = 0;

  out:      
      spec.running = false;
      spec.status = status;
      spec.clear();
      
      return status;
}

Region*
AudioRegion::get_parent()
{
      Region* r = 0;

      if (_playlist) {
            r = _playlist->session().find_whole_file_parent (*this);
      }
      
      return r;
}

void
AudioRegion::set_scale_amplitude (gain_t g)
{
      _scale_amplitude = g;

      /* tell the diskstream we're in */

      if (_playlist) {
            _playlist->Modified();
      }

      /* tell everybody else */

      send_change (ScaleAmplitudeChanged);
}

void
AudioRegion::normalize_to (float target_dB)
{
      const jack_nframes_t blocksize = 256 * 1048;
      Sample buf[blocksize];
      jack_nframes_t fpos;
      jack_nframes_t fend;
      jack_nframes_t to_read;
      double maxamp = 0;
      gain_t target = dB_to_coefficient (target_dB);

      if (target == 1.0f) {
            /* do not normalize to precisely 1.0 (0 dBFS), to avoid making it appear
               that we may have clipped.
            */
            target -= FLT_EPSILON;
      }

      fpos = _start;
      fend = _start + _length;

      /* first pass: find max amplitude */

      while (fpos < fend) {

            uint32_t n;

            to_read = min (fend - fpos, blocksize);

            for (n = 0; n < n_channels(); ++n) {

                  /* read it in */

                  if (source (n).read (buf, fpos, to_read) != to_read) {
                        return;
                  }
                  
                  maxamp = Session::compute_peak (buf, to_read, maxamp);
            }

            fpos += to_read;
      };

      if (maxamp == 0.0f) {
            /* don't even try */
            return;
      }

      if (maxamp == target) {
            /* we can't do anything useful */
            return;
      }

      /* compute scale factor */

      _scale_amplitude = target/maxamp;

      if (!_frozen) {
            char buf[64];
            snprintf (buf, sizeof (buf), _("normalized to %.2fdB"), target_dB);
            save_state (buf);
      }

      /* tell the diskstream we're in */

      if (_playlist) {
            _playlist->Modified();
      }

      /* tell everybody else */

      send_change (ScaleAmplitudeChanged);
}

void
AudioRegion::envelope_changed (Change ignored)
{
      save_state (_("envelope change"));
      send_change (EnvelopeChanged);
}

void
AudioRegion::suspend_fade_in ()
{
      if (++_fade_in_disabled == 1) {
            set_fade_in_active (false);
      }
}

void
AudioRegion::resume_fade_in ()
{
      if (_fade_in_disabled && --_fade_in_disabled == 0) {
            set_fade_in_active (true);
      }
}

void
AudioRegion::suspend_fade_out ()
{
      if (++_fade_out_disabled == 1) {
            set_fade_out_active (false);
      }
}

void
AudioRegion::resume_fade_out ()
{
      if (_fade_out_disabled && --_fade_out_disabled == 0) {
            set_fade_out_active (true);
      }
}

extern "C" {

      int region_read_peaks_from_c (void *arg, uint32_t npeaks, uint32_t start, uint32_t cnt, intptr_t data, uint32_t n_chan, double samples_per_unit) 
{
      return ((AudioRegion *) arg)->read_peaks ((PeakData *) data, (jack_nframes_t) npeaks, (jack_nframes_t) start, (jack_nframes_t) cnt, n_chan,samples_per_unit);
}

uint32_t region_length_from_c (void *arg)
{

      return ((AudioRegion *) arg)->length();
}

uint32_t sourcefile_length_from_c (void *arg)
{
      return ( (AudioRegion *) arg)->source().length() ;
}

} /* extern "C" */

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